Pipe-coupling.



0. F. BENNETT.

PIPE COUPLING.

APPucATloN man ocT.21, 1914.

1,200,798. Patented o@1;.10,1916.

-zes

NT OFFICE.

PIPE-COUPLING. y

specication of retters Patent.

Patented oct. 1o, 1916.

Application led October 27, 1914. Serial No. 868,798.

To all whom t may concern: f

Beit known that I, ORVILLE F. BENNETT, a citizen of the United States, residing at Haverhill, in the county of Essex and State of Massachusetts, have invented an Improvement in Pipe-Couplings, of whichthe following is a specification.

This invention relates to certain improvements in pipe couplings and more particularly to pipe couplings which are designed and intended to form a permanent connec-` tion between a lead pipe and an iron pipe, to avoid the expense of employing a brass nipple and making a wiped joint therebetween, as has been customary.

The'object of my invention is to provide a form of pipe coupling of the above described character, which is of simple construction and which may be readily assembled, so that the expense of making the joint will be materially less than would be required to make a wiped joint and which, further, will be absolutely tight, so that all possibility of leakage will be avoided and more specifically, my object is to provide a coupling havingthese characteristics in connection with an ordinary cast iron pipe having the usual hub at Aone end, so that the necessity of making special castings for thel purpose may be avoided. Iaccomplish these objects by the means shown in the accom panying drawing, in which Figure l is a side elevation. Fig. 2 is a longitudinal, central, sectional view of a pipe coupling embodying my invention, and, Fig. 3 is a cross sectional view on the line 3 3 of Fig; 2.

In the drawing, a indicates an ordinary cast iron pipe having a hub portion a which is of similar form to the hub, or socket ordinarily employed, but'constructed differently in the particulars hereinafter stated.

According to my invention, the portion adjacent the points when the hub is connected to the main portion of the pipe is somewhat thickened, and the bore thereof,

' at this point is formed to taper inwardly,

a smooth, conical face a2 being provided.

.The inner surface of the hub is cylindrically formed, to provide a cylindrical surface a3,-

and an annular lip a4 is extended from the main portion of the pipe into the hub portion, the inner face of said lip being continuous with the face a2, and the outer face a thereof being conically formed to taper i convergently thereto toward the ends of the in connecting radiator sections, the exterior tapering surface, or conical end portions thereof, corresponding to the conical surface a? of the pipe a, so that either end may be forced into said pipe to form a tight joint. The parts are, so formed that when the nipple b is forced into the end of the pipe a to a ycertain point, which is preferably such that the outer end of the nipple is iush withv the hub end of the pipe, theI inner tapered portion ofthe nipple will fit tightly against the surface a2, forming a tight joint` therebetween. The arrangement is such, that, when the nipple b has been forced into this position, its outer tapering surface will be in line with the surface a5 of the lip a4.

A `wedging ring o is provided, having a cylindrical outer side c1, which is adapted to fit closely into the end of the hub against the surface a3, and a conical inner surface 02, which is disposed at the same angle, with relation to the center line of the pipe as the conical surface of the outer end-portion of the nipple b.

In assembling the parts, the end portion of the lead pipe d, which is to be" connected to the iron pipe, is'expanded on a taper to correspond with the conical end of the nipple b and said expanded end portion is then pushed onto the outer end-portion of the nipple b, and forced thereon until` the end portion of the pipe passes beyond the middle portion of the nipple, and slides onto the face a5 of the lip a4. The wedging ring c is then forced into the hub of the pipe, so that 'it firmly presses the lead pipe against the outer end-portion of the nipple b, and

said forcing operation .is carried far enough so that its inner end will press the extreme inner end of the lead pipe firmly against the face a5 of the lip a4. Any suitable means 100 for pressing the wedging ring into clamping position may be employed, as the bolts e, which are passed through a flange c3 on the wedging ring o, and threaded into the hub a of the pipe. A tight joint will thus be formed between the lead pipe and the outer end portion of the nipple, and, While the joint between the face a2 of the pipe a and the inner end portion ofthe nipple .b will,

if properly formed, be suiiciently tight to i' avoid all possibility of leakage, yet the action of the wedging ring in pressing the end of the lead pipe against the face a5, furnishes additional security in case of leakage at this joint. It will also be observed that the action of the wedging ring causes the inner end of the nipple to be -forced against its seat in the pipe and to be held thereagainst. All possibility of leakage, therefore, past either end ofthe push nipple is prevented.

\The iron pipe, constructed` as above def scribed, may be cast without difficulty and the surfaces a2, a3, and a5 may be finished with a special reamer, at one operation. The push nipples may be made at small eX- pense, and usually are made by a rolling process, so that no machining is necessary, and the tapering bore of the wedging ring may or may not be finished, although'it is, also, preferably smoothed 'with a reamer. There is, therefore, no necessity of the eX- pense of any lathe work in the process of manufacture, so that the parts necessary to the joint may be made at small expense, and at less expense than the parts necessary to the wiped joint connection, which fact, coupled with the fact that the labor cost of making my joint is much less than that of making the wiped joint, yenables an important saving to be made on this account, the reliability of the joint being, at the same time, increased.

I claim j l. A pipe coupling comprising a rigid metal pipe-section having a hub at one end,

and an internal, conically-shaped face tapering inwardly from the inner end of the bore of the hub, a rigid metal nipple having two external, oppositely-disposed, conicallyshaped faces tapering toward each end and arranged 1n said pipe section with its innery conical face tightly 'seated against the said face of the pipe section and with its outer face surrounded by said hub, and a wedging ring within the hub adapted to receive the end-portion of a ductile metal pipe therein,

and to clamp the same against said outer` face of the nipple. A

2. A pipe coupling comprising a rigid metal pipe-section having a hub at one end and an internal, conically-shaped face tapering inwardly from the inner end of the bore of the hub, an annular lip integral with i said pipe-section and projecting within the A hub from the inner end of its bore and hav- *ring adapted and arranged to receive fthe end-portion of a ductile metal pipe, and to clamp the same onto the outer portion of said nipple, and onto the conical face of said lip.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.v

ORVILLE F. BENNETT. 

